ˈold ˈboy BrE AmE noun [countable]
1 . British English a man who used to be a student at a school:
an old boys’ reunion
2 . the old-boy network the system by which men who went to the same school, belong to the same club etc use their influence to help each other
3 . British English spoken an old man:
He’s a nice old boy.
4 . British English old-fashioned used when speaking to a male friend:
How are you, old boy?
⇨ ↑ old girl